Two operating modes of Jboss
Two startup methods: standalone and domain.
When a domain is started, 5 processes are started in the system: 3 instances of JBoss AS Server; 1 Domain Controller process, which is used to centrally control all servers belonging to this "domain"; and A lightweight Process Controller responsible for managing the other 4 processes and monitoring their life cycle.
Using standalone mode will start a process on the system, a single instance of JBoss AS server.